本题的功能是对图形进行操作，包括旋转、移位、放大和剪切。窗口中有4个单选按钮和一个图形面板，图形面板中有一个矩形和该矩形移位操作后的图形，任选其中一个单选按钮，则图形面板中将显示该操作后的图形。
import java.awt.*;
import java.awt..*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
public class java3

public static void main(String[]args)

JFrame frame=new TransformTestFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();


class TransformTest extends JFrame

public TransformTestFrame()

setTitle("java3");
setSize(WIDTH,HEIGHT);
Container contentPane=getContentPane();
canvas=new TransformPanel();
contentPane.add(canvas,BorderLayout,CENTER);
JPanel buttonPanel=new JPanel();
ButtonGroup group=new ButtonGroup();
JRadioButton rotateButton
=new JRadioButton("旋转",true);
buttonPanel.add(rotateButton);
group.add(rotateButton);
rotateButton.addActionListener(new
ActionListener()

public void actionPerformed(Action )

canvas.setRotate();

);
JRadioButton translateButton
=new JRadioButton("移位",false);
buttonPanel.add(translateButton);
group.add(translateButton);
translateButton.addActionListener(new
ActionListener()

public void actionPerformed(Action )

canvas.setTranslate();

);
JRadioButton scaleButton
=new JRadioButton("放大",false);
buttonPanel.add(scaleButton);
group.add(scaleButton);
scaleButton.addActionListener(new
ActionListener()

public void actionPerformed(Action )

canvas.setScale();

);
JRadioButton shearButton
=new JRadioButton("剪切",false);
buttonPanel.add(shearButton);
group.add(shearButton);
shearButton.addActionListener(new
ActionListener()

public void actionPerformed(Action )

canvas.setShear();

);
contentPane.add(buttonPanel,BorderLayout.NORTH)

private TransformPanel canvas;
private static final int WIDTH=300;
private static final int HEIGHT=300;

class TransformPanel extend JPanel

public TransformPanel()

square=new Rectangle2D.Double(-50,-50,100,100);
t=flew AffineTransform();
setRotate();

public void paintComponent()

super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
g2.translate(getWidth()/2,getHeight()/2);
g2.setPaint(Color.gray);
g2.draw(square);
g2.transform(t);
g2.setPaint(Color.black);
g2.draw(square);

public void setRotate()

t.setToRotation(Math.toRadians(30));
repaint();

public void setTranslate()

t.setToTranslation(20,15);
repaint();

public void setScale()

t.setToScale(2.0,1.5);
repaint();

public void setShear()

t.setToShear(-0.2,0);
repaint();

private Rectangle2D square;
private AffineTransform t;